Acyl-amino-dibenzanthrones and products resulting therefrom by treatment with alkylating agents



Patented May 20, 1930 UNITED STATES PATENT OFFICE PAUL NAWIa'sKY, or 'LUDWIGSHAFEN-ON-THE-RHTNE, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, T GENERAL ANILINE WORKS, INC., 013' NEW YORK, N..Y.,

' A CORPORATION 7 OF DELAWARE ACYL-AMINO-DIIBENZANTHRONES AND PRODUCTS 'RESULTING THEREFROM BY TREAT- MENT WITH ALKYLATING' AGENTS No Drawing. Application filed July 10, 1925, Serial No. 42,825, and in Germany August 11, 1924.

I have found that when acting on amino distinctly difiering from the knownproductsobtained in the absence of diluents (see U. S. Patent 1,128,836). For example, amino-dibenzanthrone is boiled with benzoyl chlorid, a violet red dye is produced, while in the presence of a diluent a blue dyestuii' results.

The dyestuffs produced in accordance with my present invention are distinguished by valuable properties which can be considerably improved by subsequently alkylating the products. Both the brilliancy of the dyeings produced with the aid of these dyestuffs and especially their fastnessto chlorine are considerably enhanced thereby.

The following examples will serve to illus- .trate further the manner of carrying this invention into practice but the invention is not confined to these examples. The parts are by weight.

' Example 1 5 0 parts of pure amino-dibenzanthrone, obtained by. reducing the nitro-dibenzanthrone obtained in accordance with U. S.

Patent 1,513,851, are introduced into-a mix- 'ture of -parts of benzoyl chlorid and 1000 parts of nitro-benzene. The mixture is heated to boilingand stirred at boiling temperature for 3 hours. On cooling, the dyestuff, corresponding to the following formula when separates out as a dark powder which is difficultly soluble, for example, in trichlorobenzene With a blue color and a red fluorescence. In concentr :ted sulfuric acid it dissolves with a reddish violet coloration. The vat prepared with the dyestuff is reddish violet and dyes cotton, after exposure to the air, a deep blue. On chlorinating strongly the dyeing turns gray.

With o-chloro-benzoyl chlorid instead of benzoyl chlorid a similar dyestufi' with a slightly more reddish tinge is obtained. Amino-is0-dibenzanthrone by the same treatment yields a beautiful violet dyestuif.

Example 2 is a powder of metallic lustre, dissolving'in sulfuric acid of 66 degrees Baum with a reddish violet color, slightly more bluish than the starting material. In boiling trichloro benzene it dissolves rather readily with a blue coloration and a red fluorescence. It dyes cotton from a pure blue vat deep navy blue shades of excellent fastness to chlorine.

With the product obtained from amino-dibenzanthrone'and benzoyl chlorid a dyestuif of a lesser reddish tinge is obtained by the same treatment, and with the product obtained from o-chloro-benzoyl chlorid and amino-isodibenzanthrone a bright violet dyestufi of excellent fastness to chlorine.

With'other alkylating agents, for example, ethyl-para-toluene-sulfonate, similar dyestuffs are obtained.

E'wdmple 3 100 parts of pure amino-dibenza'nthrone are stirred for three hours, at 160 degrees centigrade, with 2000 parts of nitrobenzene and 100 parts of toluene-sulfochlorid. .The dyestufi produced can be separated from the reaction mixture for example by distillation with steam and corresponds probably to the formula:

2. The process of producing newvat dyestufi's of the dibenzanthrone series whlch comprises acting on an amino derivative of the dibenzanthrone series with an acylating agent in the presence of at least such an amount of an inert organic diluent that the resulting mixture canbe stirred when warm and subsequently treating the product with an alkylating agent.

3. As new articles of manufacture acylated amino-dibenzanthrones which are obtainable by acting upon an amino derivative of a-dibenzanthrone with an acylating agent in at least such an amount of an inert organic diluent that the resulting mixture can be stirred when warm, which products are dyestufls not fast to chlorine and arealtered by the action of alkylating agents.

4. As new articles of manufacture, alkylacyl-amino-dibenzanthrones containing both an alkyl-and an acyl group bound to the same nitrogen atom;

In testimony whereof I have hereunto set m hand.

y PAUL NAWIASKY.

It forms a dark powder which is soluble red- I dish violet in concentrated sulfuric acid, and difiicultly soluble in hot trichlorobenzene with a blue color and a red fluorescence. It

bluish gray.

Example 4 parts of the dyestufi' obtained according to Example 3 are boiled under a reflux cooler, for 3 hours, with 1000 parts of tri-chlorobenzene, 50 parts of toluene sulfonic acid methyl ester and 50 parts of calcined sodium carbonate. When cool, the reaction product is filtered off and freed from any adhering solvent and salts in a suitable manner. The new dyestuff, the constitution of which has not yet been ascertained, d es cotton from stuffs of the dibenzanthrone series 'which comprises acting on an amino derivative of the dibenzanthrone series with an acylating agent in the presence of at least such an amount of an inert organic diluent that the resulting mixture can 'be stirred when warm.

dyes cotton from a reddish violet vat bluish green v shades which on cholorinating turn 

